McQuay MWM Service Manual Book page 46

Ducted Blower B/D/ER Series Model – Multi Compressors
Rooftop Packaged Air Conditioner – Multi Compressors
Model
SB 150B2/BR2 – 600B4/BR4
SB 125D2 – 500D4
SB 125ER2 – 600ER4
RT 150 – 420A/AR
Error Code
When the system is on and an error occurs, the ON/OFF LED on the LCD panel will blink and an error
code is shown. When the system is off and there is a thermistor error, the ON/OFF LED is off but the error
code is still displayed. Each error code represents different message as below:
Error
Faulty Indication
Code
E01 Require manual reset (possible causes)
Compressor 1 high temperature
E02
(overload)
Compressor 2 high temperature
E03
(overload)
Compressor 3 high temperature
E04
(overload)
Compressor 4 high temperature
E05
(overload)
Compressor 1 high pressure trip /
E06
contact open
Compressor 2 high pressure trip /
E07
contact open
Compressor 3 high pressure trip /
E08
contact open
Compressor 4 high pressure trip /
E09
contact open
Compressor 1 trip / low refrigerant /
E10
outdoor abnormal
Compressor 2 trip / low refrigerant /
E11
outdoor abnormal
Compressor 3 trip / low refrigerant /
E12
outdoor abnormal
Compressor 4 trip / low refrigerant /
E13
outdoor abnormal
E14 Room sensor short
E15 Room sensor open
E16 Indoor coil sensor 1 short
E17 Indoor coil sensor 2 short
E18 Indoor coil sensor 3 short
Board Handset
SQ2.0 SQ-LCD
SQ2.0 SQ-LCD
SQ2.0 SQ-LCD
SQ2.0 SQ-LCD
Error
Code
E19
E20
E21
E22
E23
E24
E25
E26
E27
E28
E29
E30
E31
E32
E33
E34
E35
Faulty Indication
Indoor coil sensor 4 short
Indoor coil sensor 1 open
Indoor coil sensor 2 open
Indoor coil sensor 3 open
Indoor coil sensor 4 open
Outdoor coil sensor 1 short
Outdoor coil sensor 2 short
Outdoor coil sensor 3 short
Outdoor coil sensor 4 short
Outdoor coil sensor 1 open
Outdoor coil sensor 2 open
Outdoor coil sensor 3 open
Outdoor coil sensor 4 open
Compressor 1 de-ice
Compressor 2 de-ice
Compressor 3 de-ice
Compressor 4 de-ice
45